Got a fever at night after receiving the flu vaccine during the day

Apr 07, 2023 Source: Cainiu Health

Dr. Guo Xiheng

Introduction

Fever refers to an elevated body temperature. Developing a fever at night after receiving the influenza vaccine during the day is generally considered a normal phenomenon. The flu vaccine is a live attenuated influenza virus vaccine, primarily used to prevent illnesses such as colds, bronchitis, and pneumonia caused by infection with types A, B, and C influenza viruses. It is typically recommended for individuals with relatively low resistance, such as children under 5 years old, elderly people over 60 years old, and those with weakened immune systems.

Fever refers to an elevated body temperature. Developing a fever at night after receiving the influenza vaccine during the day is generally considered a normal occurrence.

The influenza vaccine is a live attenuated vaccine primarily used to prevent illnesses caused by influenza A, B, and C virus infections, such as the common cold, bronchitis, and pneumonia. It is commonly recommended for individuals with relatively low immunity, including children under 5 years of age, adults over 60, and those with compromised immune systems.

Developing a fever at night after receiving the flu shot during the day is a common side effect. This typically occurs because the vaccine activates the body's immune system, prompting it to produce antibodies. This process may lead to mild discomforts such as fever, headache, and muscle aches. In most cases, these symptoms resolve spontaneously within 24 to 48 hours and are considered normal, requiring no special treatment. After vaccination, it is advisable to get adequate rest and avoid excessive physical exertion. Drinking plenty of water can help the body eliminate waste products and toxins generated after vaccination, thereby alleviating discomfort.

If a high fever develops, applying a cool, damp cloth or ice pack may help reduce body temperature. If symptoms are severe or persist for an extended period, prompt medical attention is recommended. When necessary, medication may be used under a doctor’s guidance.

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